High speed turboalternator for domestic combined heat and powerunit

摘要

As part of an investigation into a small scale gas turbine CHPunit for the home, a high speed 1 kW permanent magnet cylindricalalternator has been constructed. For test purposes, the alternator wascombined with the turbine and bearings from a commercial turbocharger toform a turboalternator capable of being driven by compressed air. Acritical speed analysis of the arrangement was conducted and extensivetests were carried out at a speed of 32000 rev/min, at which pointvibrations in the bearing housing became too large. At this speed thealternator was shown to produce its designed output. Machine powerlosses were estimated with a series of acceleration/deceleration tests